Quote from: MinerHQ on June 06, 2017, 03:26:23 AM

1. Do you provide the winners contact details for us to ask the proofs?

2. I will wait for your details to be posted on this thread to check. I'm interested in lottery winner choosing process not in the hi-low game. Because that game is fair and never said that it is not fair but the issue is high house edge.

Hi Miner, quick responses for you...

1. All activity on FreeBitco.in is kept private for the member...from faucet activity to multiply activity to lottery wins to online wallet transaction activity to interest earnings. If you want to solicit volunteers to share their stories you should start a thread!

2. Have you been to our site? There's a link (highlighted in blue) on the Free BTC and Multiply BTC pages titled "Provably Fair". This is an active link and if you click on it you'll find all the details on how our system is provably fair.

Here's the actual text from the Free BTC game:
This game is provably fair. What that means is that there is no way the site can cheat you by picking a number that is in our favour.

The way this works is that each roll is calculated using 3 parameters - the server seed, client seed and nonce. Out of these, we show you the client seed and nonce that will be used for your next roll along with a SHA256 hash of the server seed. You can also change the client seed if you wish. The server seed is the only part that is kept a secret until after the roll.

Then after you roll, under the section titled PREVIOUS ROLL DETAILS, we show you the server seed that was used and you can verify that this was the same server seed that we said we were going to use before the roll by checking if the SHA256 hash of this seed matches the SHA256 hash that we showed you before the roll.To know exactly how we calculate the rolls, read the section below titled How are rolls calculated?

After you roll, you can also click the link above named CLICK HERE TO VERIFY YOUR ROLLS to verify your roll using our javascript based roll verifier which uses the same seeds to re-calculate the roll right in your browser without any external communication.

How are rolls calculated?

Two strings are created :
STRING1 = "[NONCE]:[SERVER SEED]:[NONCE]"
STRING2 = "[NONCE]:[CLIENT SEED]:[NONCE]"
For your last roll :
STRING1 = "110048:37bb1ccb4790213f6c72f97c2e99ebf7d8464398a64dad8d4218fa41d2f2a579:110048"
STRING2 = "110048:GYpiBTwWqM8aThNw:110048"
Then HMAC-SHA512 is used to hash STRING1 with STRING2 as the secret key, giving us a 128 character hex string.
The first 8 characters of the hex string are taken and converted to a decimal.
This decimal is then divided by 429496.7295 and rounded off to the nearest whole number.
This whole number is used as your roll, with the maximum possible value being 10,000.